<template>
    <div class="spinner"  :style="{width: size + 'px', height: size + 'px'}">
        <div class="spinner-container container1">
            <div :style="{'width': cirSize, 'height': cirSize, 'background-color': color }" class="circle1"></div>
            <div :style="{width: cirSize, height: cirSize, 'background-color': color }" class="circle2"></div>
            <div :style="{width: cirSize, height: cirSize, 'background-color': color }" class="circle3"></div>
            <div :style="{width: cirSize, height: cirSize, 'background-color': color }" class="circle4"></div>
        </div>
        <div class="spinner-container container2">
            <div :style="{width: cirSize, height: cirSize, 'background-color': color }" class="circle1"></div>
            <div :style="{width: cirSize, height: cirSize, 'background-color': color }" class="circle2"></div>
            <div :style="{width: cirSize, height: cirSize, 'background-color': color }" class="circle3"></div>
            <div :style="{width: cirSize, height: cirSize, 'background-color': color }" class="circle4"></div>
        </div>
        <div class="spinner-container container3">
            <div :style="{width: cirSize, height: cirSize, 'background-color': color }" class="circle1"></div>
            <div :style="{width: cirSize, height: cirSize, 'background-color': color }" class="circle2"></div>
            <div :style="{width: cirSize, height: cirSize, 'background-color': color }" class="circle3"></div>
            <div :style="{width: cirSize, height: cirSize, 'background-color': color }" class="circle4"></div>
        </div>
    </div>
</template>

<script>
    export default {
        props: {
            color: {
                type: String,
                default: '#999'
            },
            size: {
                type: Number,
                default: 40
            }
        },
        computed: {
            cirSize() {
                return this.size * 0.25 + 'px'
            }
        }
    }
</script>

<style lang="less" scoped>
    .spinner {
        position: relative;
    }

    .container1 > div, .container2 > div, .container3 > div {
        border-radius: 100%;
        position: absolute;
        -webkit-animation: bouncedelay 1.2s infinite ease-in-out;
        animation: bouncedelay 1.2s infinite ease-in-out;
        -webkit-animation-fill-mode: both;
        animation-fill-mode: both;
    }
        
    .spinner .spinner-container {
        position: absolute;
        width: 100%;
        height: 100%;
    }
        
    .container2 {
        -webkit-transform: rotateZ(45deg);
        transform: rotateZ(45deg);
    }
        
    .container3 {
        -webkit-transform: rotateZ(90deg);
        transform: rotateZ(90deg);
    }
        
    .circle1 { top: 0; left: 0; }
    .circle2 { top: 0; right: 0; }
    .circle3 { right: 0; bottom: 0; }
    .circle4 { left: 0; bottom: 0; }
        
    .container2 .circle1 {
        -webkit-animation-delay: -1.1s;
        animation-delay: -1.1s;
    }
        
    .container3 .circle1 {
        -webkit-animation-delay: -1.0s;
        animation-delay: -1.0s;
    }
        
    .container1 .circle2 {
        -webkit-animation-delay: -0.9s;
        animation-delay: -0.9s;
    }
        
    .container2 .circle2 {
        -webkit-animation-delay: -0.8s;
        animation-delay: -0.8s;
    }
        
    .container3 .circle2 {
        -webkit-animation-delay: -0.7s;
        animation-delay: -0.7s;
    }
        
    .container1 .circle3 {
        -webkit-animation-delay: -0.6s;
        animation-delay: -0.6s;
    }
        
    .container2 .circle3 {
        -webkit-animation-delay: -0.5s;
        animation-delay: -0.5s;
    }
        
    .container3 .circle3 {
        -webkit-animation-delay: -0.4s;
        animation-delay: -0.4s;
    }
        
    .container1 .circle4 {
        -webkit-animation-delay: -0.3s;
        animation-delay: -0.3s;
    }
        
    .container2 .circle4 {
        -webkit-animation-delay: -0.2s;
        animation-delay: -0.2s;
    }
        
    .container3 .circle4 {
        -webkit-animation-delay: -0.1s;
        animation-delay: -0.1s;
    }
        
    @-webkit-keyframes bouncedelay {
        0%, 80%, 100% { -webkit-transform: scale(0.0) }
        40% { -webkit-transform: scale(1.0) }
    }
        
    @keyframes bouncedelay {
        0%, 80%, 100% {
            transform: scale(0.0);
            -webkit-transform: scale(0.0);
        } 40% {
            transform: scale(1.0);
            -webkit-transform: scale(1.0);
        }
    }
</style>